SMA6L15A Equivalent & Substitute Parts

Part Overview

The SMA6L15A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 15V reverse standoff voltage with a 24.4V maximum clamping voltage and 24.6A peak pulse current capability in a DO-221AC package. The part is Active status and RoHS3 compliant, with unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives meeting the same electrical and mechanical specifications.

Substiute Parts

SMA6L15A

Littelfuse Inc.In Stock: 2244SMA6L15A Datasheet

Current PartRFQ

TPSMA6L15A

Littelfuse Inc.In Stock: 9410TPSMA6L15A Datasheet

DirectRFQ

SM4T18AY

STMicroelectronicsIn Stock: 3186SM4T18AY Datasheet

MFR RecommendedRFQ

SMA6J15A-TR

STMicroelectronicsIn Stock: 1415SMA6J15A-TR Datasheet

MFR RecommendedRFQ

SMAJ15A-E3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 41450SMAJ15A-E3/61 Datasheet

MFR RecommendedRFQ

SMAJ15A-TR

STMicroelectronicsIn Stock: 74099SMAJ15A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMA6L15A is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 15V
• Voltage - Breakdown (Min): 16.7V
• Unidirectional Channels: 1
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Package compatibility: DO-221AC or DO-214AC (SMA form factor)

Substitute parts must maintain the same reverse standoff voltage (15V) and breakdown voltage (16.7V minimum) to ensure equivalent circuit protection. Clamping voltage, peak pulse current, and power dissipation may vary within acceptable ranges for the application. All identified substitutes are Active status components with RoHS3 compliance and surface-mount configuration.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain the critical electrical parameters required for equivalent circuit protection: 15V reverse standoff voltage and 16.7V minimum breakdown voltage. Selection among these alternatives is based on product availability, manufacturing source preference, and specific application requirements.

TPSMA6L15A is the closest electrical equivalent to SMA6L15A, offering identical clamping voltage (24.4V) and peak pulse current (24.6A) specifications. This part carries Littelfuse manufacturing and AEC-Q101 automotive qualification, with operating temperature range of -50°C to 150°C.

SM4T18AY and SMAJ15A-TR are STMicroelectronics alternatives with higher peak pulse current ratings (71A) and clamping voltages (32.5V), providing enhanced transient suppression capability. These parts are AEC-Q101 qualified and suitable for applications requiring higher energy dissipation margins.

SMA6J15A-TR offers the highest peak pulse current (123A) and extended operating temperature range (-55°C to 175°C), with 600W power dissipation matching the original specification.

SMAJ15A-E3/61 is a Vishay alternative with 24.4V clamping voltage and 16.4A peak pulse current, providing a conservative substitute with reduced current handling compared to the original part.

All substitutes are RoHS3 compliant, Active status components in surface-mount configuration suitable for direct PCB replacement where package footprint compatibility is confirmed.

Frequently Asked Questions (FAQ)

Q: Can TPSMA6L15A directly replace SMA6L15A?

A: Yes. Both parts share identical electrical specifications: 15V reverse standoff, 16.7V breakdown voltage, 24.4V clamping voltage, and 24.6A peak pulse current. Both use DO-221AC packaging with SMA flat leads. The primary difference is operating temperature range: TPSMA6L15A operates from -50°C to 150°C versus SMA6L15A's -65°C to 150°C. Verify application temperature requirements before substitution.

Q: What is the difference between DO-221AC and DO-214AC packages?

A: DO-221AC (SMA Flat Leads) and DO-214AC (SMA) are both surface-mount packages with similar form factors and pin configurations. DO-221AC features flat leads while DO-214AC uses standard leads. Both are mechanically compatible for most PCB designs, though lead geometry should be confirmed against PCB pad layout specifications.

Q: Are SM4T18AY and SMAJ15A-TR interchangeable with SMA6L15A?

A: These parts share the same 15V reverse standoff and 16.7V breakdown voltages, making them electrically compatible for circuit protection function. However, they feature higher clamping voltages (32.5V) and peak pulse currents (71A), providing enhanced transient suppression. Use these substitutes only when application design permits higher clamping voltage specifications.

Q: Why does SMAJ15A-E3/61 have lower peak pulse current than SMA6L15A?

A: SMAJ15A-E3/61 is rated for 16.4A peak pulse current compared to SMA6L15A's 24.6A. This part is suitable for applications with lower transient energy requirements. Verify that application transient current levels do not exceed 16.4A before selecting this substitute.

Q: Which substitute offers the widest operating temperature range?

A: SMA6J15A-TR provides the extended operating temperature range of -55°C to 175°C, compared to SMA6L15A's -65°C to 150°C. This part is suitable for high-temperature applications requiring operation above 150°C.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All identified substitute parts are RoHS3 compliant and carry Active product status, meeting current environmental and regulatory requirements for electronic component manufacturing.